48 lines
1.3 KiB
HTML
48 lines
1.3 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>dn724</title>
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<input type="number" min="0" placeholder="your ASN" oninput="calculate(this)">
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<p>Port: <span id="result"></span></p>
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<script>
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const result = document.getElementById('result');
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const isNumber = (s) => /^\d+$/.test(s);
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function calculate(el) {
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console.log(el);
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if (el.value == '') {
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result.innerText = '';
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return;
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}
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let cand = cyrb53(el.value).toString().slice(0, 5);
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if (cand > 65535 || cand < 30000) {
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cand = (cand % 3 + 3) * 10000 + (cand % 10000);
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}
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result.innerText = cand;
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}
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const cyrb53 = (str, seed = 0) => {
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let h1 = 0xdeadbeef ^ seed, h2 = 0x41c6ce57 ^ seed;
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for(let i = 0, ch; i < str.length; i++) {
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ch = str.charCodeAt(i);
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h1 = Math.imul(h1 ^ ch, 2654435761);
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h2 = Math.imul(h2 ^ ch, 1597334677);
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}
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h1 = Math.imul(h1 ^ (h1 >>> 16), 2246822507);
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h1 ^= Math.imul(h2 ^ (h2 >>> 13), 3266489909);
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h2 = Math.imul(h2 ^ (h2 >>> 16), 2246822507);
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h2 ^= Math.imul(h1 ^ (h1 >>> 13), 3266489909);
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return 4294967296 * (2097151 & h2) + (h1 >>> 0);
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};
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</script>
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</html>
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